Power Puck (IMAGE) DOE/Pacific Northwest National Laboratory Caption This small device makes electricity whenever there's a temperature difference across its two ends. The Power Puck is being marketed by Perpetua Power Source Technologies and uses technology developed at Pacific Northwest National Laboratory Credit Perpetua Power Source Technologies Usage Restrictions Credit Perpetua Power Source Technologies License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.